shuffle a character array

[Mike Parker via Digitalmars-d-learn]

On Wednesday, 20 July 2016 at 08:02:07 UTC, Mike Parker wrote:
> On Wednesday, 20 July 2016 at 07:49:38 UTC, celavek wrote:

> If you are absolutely, 100% certain that you are dealing with 
> ASCII, you can do this:
>

And I forgot to add:

Otherwise, you'll want to convert to dchar[] (probably via 
std.utf.toUTF32) and pass that along instead.